Median-averaged global ME expansion from the UVS reference oval in the north vs. in the south for perijoves 1 through 54. The fitted relationship is given by a solid black line; its form and R-squared goodness-of-fit value are given in the legend. The 1σ confidence level of the fit is given by the shaded region. The position of the origin is denoted by two dotted black lines. Negative (positive) values of ME expansion indicate a global contraction (expansion) of the ME.